Watch Other People Work
This could mean pairing with people or shadowing people or even watching people who stream their coding sessions. Just seeing someone else work might expose you to features of a language you didn't know about, programming techniques you didn't know about, or even expose you to new tools you didn't know about. It can show you tricks or optimizations for your code editor or terminal or other pieces of your dev environment.
It can also be a great reminder that the process of writing code is messy for everyone. Too often we just see the code that people are ready to have reviewed but don't see the trial and error that goes into writing it. Seeing the way people think about a problem and how they actually work on it can be both informative and reassuring.